ESB-2017.1998 - [Appliance] ABB SREA-01 and ABB SREA-50: Access privileged data - Remote/unauthenticated 2017-08-11

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.1998
                          ABB SREA-01 and SREA-50
                              11 August 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           ABB SREA-01
                   ABB SREA-50
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Access Privileged Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-9664  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-222-05

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Advisory (ICSA-17-222-05)

ABB SREA-01 and SREA-50

Original release date: August 10, 2017

Legal Notice

All information products included in http://ics-cert.us-cert.gov are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the
header. For more information about TLP, see http://www.us-cert.gov/tlp/.

CVSS v3 9.8

ATTENTION: Remotely exploitable/low skill level to exploit. Public exploits
are available.

Vendor: ABB

Equipment: SREA-01 and SREA-50

Vulnerability: Relative Path Traversal

AFFECTED PRODUCTS

ABB reports that the vulnerability affects the following SREA-01 and
SREA-50 legacy remote monitoring tools and Ethernet adapters:

    SREA-01 revisions A, B, C: application versions up to 3.31.5, and
    SREA-50 revision A: application versions up to 3.32.8

IMPACT

An attacker who successfully exploits this vulnerability could access files
on the affected products' file systems, view data, change configuration,
retrieve password hash codes, and potentially insert and send commands to
connected devices without authorization.

MITIGATION

HMS Industrial Networks Ab created an update to resolve a publicly reported
vulnerability in the ABB products listed above. Products are based on
a legacy software platform which is no longer actively maintained. The
problem is corrected by installing a patch that is available at the
following location:

http://search-ext.abb.com/library/Download.aspx?DocumentID=9AKK107045A1782&LanguageCode=en&DocumentPartId=&Action=Launch
(link is external)

Note: ABB has tested the patch only with the latest revisions of the
SREA-01. The patch should also be applicable to the latest revisions of
the SREA-50. If an old revision of hardware is in use, it is suggested to
replace the hardware either with latest revision or with some other remote
monitoring tool.

NCCIC/ICS-CERT recommends that users take defensive measures to minimize
the risk of exploitation of this vulnerability. Specifically, users should:

    Minimize network exposure for all control system devices and/or systems,
    and ensure that they are not accessible from the Internet.
    Locate control system networks and remote devices behind firewalls,
    and isolate them from the business network.
    When remote access is required, use secure methods, such as Virtual
    Private Networks (VPNs), recognizing that VPNs may have vulnerabilities
    and should be updated to the most current version available. Also
    recognize that VPN is only as secure as the connected devices.

ICS-CERT reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

ICS-CERT also provides a section for control systems security recommended
practices on the ICS-CERT web page. Several recommended practices are
available for reading and download, including Improving Industrial Control
Systems Cybersecurity with Defense-in-Depth Strategies.

Additional mitigation guidance and recommended practices are
publicly available in the ICS-CERT Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies, that is available for download from the ICS-CERT web site.

Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to ICS-CERT for
tracking and correlation against other incidents.

VULNERABILITY OVERVIEW

RELATIVE PATH TRAVERSAL CWE-23

An attacker may access internal files of the affected products without
any authorization over the network, using a HTTP request which refers to
files using ../../ relative paths.

Once the internal password file is retrieved, the password hash can be
identified using a brute force attack. There is also an exploit allowing
running of commands after authorization.

CVE-2017-9664 has been assigned to this vulnerability. A CVSS v3
base score of 9.8 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

RESEARCHER

Bertin Jose and Fernandez Ezequiel discovered the vulnerability. HMS
Industrial Networks Ab provided a patch to correct the issue.

BACKGROUND

Critical Infrastructure Sectors: Critical Manufacturing, Energy

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Switzerland

Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov (link sends e-mail)
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900

For industrial control systems security information and incident reporting:
http://ics-cert.us-cert.gov

ICS-CERT continuously strives to improve its products and services. You
can help by choosing one of the links below to provide feedback about
this product.

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